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Study on the Application of Fuzzy-Ball Plugging System for Stable Gas Production and Water Control in Tight Gas Wells 30th

Study on the Application of Fuzzy-Ball Plugging System for S...

引用

30th International Conference on Computational and Experimental Engineering and sciences

作者： Gan, Maozong Liu, Yuetian Zheng, Lihui China Univ Petr Dept Petr Engn Beijing 102249 Peoples R China

ISBN: (纸本)9783031774911;9783031774898;9783031774881

Water production of tight gas wells in LX block markedly hinders optimal gas extraction, compelling the urgent development of efficacious water control system. Current strategies include drainage gas production, mechanical water blocking, and chemical water blocking. Drainage gas extraction is suitable for gas wells with small water production. Mechanical water blocking is chiefly tailored for wells with well-definedwater-producing layers. Chemical water blocking employs selective agents, such as polymers, microemulsions, and fuzzy-balls, to selectively control high-permeability layers and unlock the production potential latent within low-permeability reservoirs. Laboratory experiments evaluated the performance and injection volumes of the fuzzy-ball plugging system (FBPS), leading to three formulations for varied blocking strengths and the implementation of breakthrough pressure gradients (BPG) to assess control effect. The observed surge in water flow resistance (71.77%-78.92%) far exceeds gas resistance (13.34%-20.22%), maintaining stable gas and water control in tight gas wells. Fuzzy-balls degrade with a small percentage of ammonium persulfate, still offering water control properties. Field application of FBPS in wells LX-35 and LX D-1-1D significantly improved gas production and reduced water output. The FBPS's adaptability for blocking in varied reservoir conditions, with potential for wide application due to its distinctive rheological properties and capability for selective, deep injection, positioning it as an effective solution for tight gas water control.

关键词： Tight gas Fuzzy-ball Breakthrough pressure gradient Water control Gas production

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Improving Self-Lubricating Sliding Bearing Performances 12th

Improving Self-Lubricating Sliding Bearing Performances

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12th International Conference of machine and Industrial Design in Mechanical Engineering

作者： Marinkovic, Aleksandar B. Simonovic, Ivan M. Univ Belgrade Fac Mech Engn Belgrade Serbia

ISBN: (纸本)9783031805141;9783031805127;9783031805110

Self-lubricating sliding bearings are widely used in numerous industrial applications, primary regarding their specific lubrication mechanism. This lubrication mechanism is a main advantage compared with classical sliding bearings, where their production is not so complicate and makes lower price. This kind of bearing could be simple to assembly and in operating produce less noise and vibrations. According to their material and type of operating, self-lubricating sliding bearings could operate with oil (grease) in its own material structure or even without any amount of lubricant. After several numerical and experimental investigations on porous metal bearings conducted at Faculty of Mechanical Engineering, University of Belgrade authors of the paper introduce some new materials and methods such are different composite, or polymer materials suitable for self-lubricating sliding bearing production. Those materials allow bearing operating in dry lubrication regime and makes a step forward in improving performances this kind of bearings. Novel class of two-dimensional materials, derived from MAX phase, named MXenes have ability for widely use in fields and applications due to their unique structure and properties. The distinct structure, low shear resistance, and easy-to-modify ability endow MXenes with particularly superior lubrication potentials sound excellent for application in self-lubrication bearings. The main goal of the paper is to explain and suggest this new materials aimed to improve and optimized operational performances of classical self-lubricating sliding bearings.

关键词： Self-Lubricating Sliding Bearing Lubrication Solid Lubricants Optimization MXenes

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Prediction of Weld Bead Cross Section in WAAM Based on CNN 30th

Prediction of Weld Bead Cross Section in WAAM Based on CNN

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30th International Conference on Computational and Experimental Engineering and sciences

作者： Li, Rui Zhai, Wenzheng Yang, Xuhui Ma, Xiaoyao Ling, Congcong Wang, Guilan Zhang, Haiou Li, Zili Huazhong Univ Sci Technol Sch Software Engn Wuhan Peoples R China Huazhong Univ Sci & Technol Sch Mech Sci & Engn Wuhan Peoples R China Huazhong Univ Sci & Technol Sch Mat Sci & Engn Wuhan Peoples R China

ISBN: (纸本)9783031816758;9783031816734;9783031816727

Wire Arc Additive Manufacturing (WAAM) is an advanced digital technology for three-dimensional solid manufacturing. In contrast to traditional subtractive and equal-material manufacturing methods, WAAM is founded on the "bottom-up" layered discrete free form of digital 3D models, offering innovative design and manufacturing flexibility. This technology is not limited by part shapes and can efficiently create complex structural components that are difficult to produce with traditional methods. To tackle challenges in process parameter selection and predicting forming outcomes in practical arc additive manufacturing, a precise and efficient mathematical method has been devised to forecast the morphology of single-pass forming. This method enables rapid and convenient process parameter selection for Wire Arc Additive Manufacturing and assists in quality control during forming processes. This article introduces a pure convolutional neural network (CNN) model along with a loss function. Based on a single-pass single-layer wire arc additive manufacturing experiment, the CNN algorithm uses process parameters as input to predict the model and develop a comprehensive prediction model for the cross-sectional profile of the weld bead. Furthermore, employing this pure CNN network model and loss function greatly aids in predicting the single-layer morphology of arc additive manufacturing. The results show that the method proposed in this article can accurately forecast the cross-sectional profiles of single-layer single-pass and multi-layer single-pass welding beads in arc additive manufacturing.

关键词： WAAM Cross section CNN Point cloud

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Optimizing of the WEDM Technologies Used in Progressive Dies Manufacturing 12th

Optimizing of the WEDM Technologies Used in Progressive Dies...

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12th International Conference of machine and Industrial Design in Mechanical Engineering

作者： Branescu, Andrei Horia Pascu, Adrian Marius Cofaru, Nicolae Florin Petrascu, Olivia-Laura Lucian Blaga Univ Sibiu Sibiu Romania

ISBN: (纸本)9783031805141;9783031805127;9783031805110

Within this paper, a study has been carried out, aiming to optimize the geometrical and technological parameters of the WEDM technologies used in progressive dies manufacturing. This optimization is the main aim of our study. The objectives of the study are: to create a generalized and parameterized geometric CAD model of the die plate, to carry out a static analysis, to use finite element method within this geometrical model and to optimize the tag size with respect to the dimensions of the circular pocket (radius and height) using a Taguchi analysis, in order to obtain minimum values for von Mises equivalent stresses. The results of the paper highlight the factors that most influence the response function. The nomograms and regression equations could be a practical guide in selecting the length of the tag under given conditions.

关键词： WEDM progressive dies tag optimization FEM Taguchi analysis

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Research and Design of a System for the Measurement of Dielectric Characteristics of Near-Bit Fluids 30th

Research and Design of a System for the Measurement of Diele...

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30th International Conference on Computational and Experimental Engineering and sciences

作者： Wang, Zizhen Li, Jun Yang, Hongwei Zhou, Ronghao Liu, Gonghui China Univ Petr Beijing Peoples R China China Univ Petr Beijing Karamay Xinjiang Peoples R China

ISBN: (纸本)9783031816758;9783031816734;9783031816727

In complex drilling environments, the dielectric characteristics of the near-bit fluid (drilling muds) can directly reflect its content and nature of the solid-phase particles, liquids and gases. The dielectric constant and conductivity are two major electrical parameters of near-bit fluids, whose values make a difference to the amplitude and phase of measured signals, ultimately leading to insufficient accuracy in understanding fluid properties during drilling. This is one of the reasons why downhole gas kick and mud loss cannot be effectively controlled. Therefore, clarifying the dielectric properties of near-bit fluids is an essential job in identifying and interpreting complex operating conditions of downhole wells. Considering that the water content, temperature, and density of the fluid can affect its dielectric characteristics to varying degrees, this paper adopts a sensor with four-core annular electrodes to measure the dielectric characteristics of the near-bit fluid. Based on the finite element method (FEM), a simulation modeling experiment is conducted on the current density distribution of dielectric sensors, and a dielectric measurement system prototype is designed and built, mainly including dielectric sensors, a hardware control circuit, and an upper computer. The results show that the system can be used to access the dielectric characteristic parameters of the near-bit fluid, further verifying the feasibility of safety prewarning over the drilling process through dielectric characteristic monitoring.

关键词： Dielectric characteristics Impedance measurement Near-bit fluid Drilling safety

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Analysis of Dynamic Phenomena in the Hydraulic Circuit of the Engine Lubrication System 12th

Analysis of Dynamic Phenomena in the Hydraulic Circuit of th...

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12th International Conference of machine and Industrial Design in Mechanical Engineering

作者： Rychtar, Vaclav Maly, Miroslav Zvolsky, Tomas Skoda Auto As Mlada Boleslav Czech Republic Tech Univ Liberec Liberec Czech Republic

ISBN: (纸本)9783031805141;9783031805127;9783031805110

The oil systems of internal combustion engines ensure not only the distribution of lubricant to individual parts of the engine's movement mechanisms, but can be a source of energy to ensure other functions-for example, for the actuators of variable camshaft timing systems. As part of the experiments and their evaluation, attention was paid to significant pressure phenomena in the oil system. The work was mainly focused on the identification of pressure pulsations in parts of the lubrication system in places near the crankshaft sliding bearings. Measurements within the experiments were carried out on a 3-cylinder gasoline engine under different conditions.

关键词： Lubrication System Combustion Engines Pressure Pulsation

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Wind-Induced Failure Analysis of Transmission Towers Based on the Press-Bending State of Diagonal Members 30th

Wind-Induced Failure Analysis of Transmission Towers Based o...

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30th International Conference on Computational and Experimental Engineering and sciences

作者： Wu, Hainan Xie, Qiang Wu, Ming'er Tongji Univ Shanghai 200092 Peoples R China Tongji Univ State Key Lab Disaster Reduct Civil Engn Shanghai 200092 Peoples R China

ISBN: (纸本)9783031774911;9783031774898;9783031774881

In recent years, an increasing number of steel latticed transmission towers collapsing under strong winds has been observed. Based on the finite element model of the actual collapsed tower in 2021 China, static nonlinear buckling analysis was performed to estimate the ultimate bearing capacity and the most vulnerable members of the tower in this paper. Considering the moment caused by the semi-rigid connection between the leg and diagonal members, the press-bending member stability state assessment method is developed to identify the weak locations in the transmission tower. The results show that the collapse wind speed is 35.10 m/s and the primary failure member is the diagonal member in the first panel featuring redundant members. And the main member in the lower panel of the failed diagonal member can serve as the secondary weak member. The weak position corresponds to the actual failure. The press-bending state assessment method of diagonal members could effectively analyze the capacity and vulnerable members of towers, which can serve as a reference for structural failure analysis.

关键词： Transmission tower Wind-induced failure Static nonlinear buckling analysis Press-bending state assessment method Failure location

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Mathematical and Mechanical Model of a Tamping Rammer for Making Rammed Earth Walls 33rd

Mathematical and Mechanical Model of a Tamping Rammer for Ma...

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33rd International Conference on Robotics in Alpe-Adria-Danube Region (RAAD)

作者： Morariu-Gligor, Radu Mircea Tech Univ Cluj Napoca 103-105 Muncii Blvd Cluj Napoca Romania

ISBN: (纸本)9783031592591;9783031592577;9783031592560

The paper presents a mechanization/automation model for the process of making rammed earth walls. Since all the parameters of the production system depend on the compaction process, the paper proposes a mechanical and mathematical model of a tamping rammer used for the construction of rammer earth walls. Based on this mathematical model, a series of studies can be carried out on the influence of the various components of the compactor on both the compaction process and the entire robot.

关键词： Rammed earth wall Tamping rammer Mathematical model

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Design and Characterization of a New Soft Robotic Gripper 5th

Design and Characterization of a New Soft Robotic Gripper

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5th International Conference of International-Federation-for-the-Promotion-of-Mechanism-and-machine-science Italy (IFToMM Italy)

作者： Burini, Virginia Logozzo, Silvia Valigi, Maria Cristina Univ Perugia Via G Duranti Perugia Italy

ISBN: (纸本)9783031645716;9783031645693;9783031645686

In recent decades, soft robotic grippers have been widely studied for their interesting functionalities and sustainable impact in a lot of scientific and commercial applications. In this scenario, 3D-printed, and economic soft devices are increasingly designed and developed to enhance their performance in terms of precision, robustness, and versatility. This paper presents the design and characterization of a new 3D-printed underactuated soft gripper with four new soft monolithic fingers driven by tendons. The fingers' characterization is focused on the determination of the stiffness both using theoretical FEM simulations and experimental measurements. Two different materials were considered and studied. In addition, the trajectories of the fingers made in two different materials were experimentally traced and the vertical displacement correlated to the force applied to the tendon. Results of this paper provide an important approach for investigating the mechanical properties of this new type of gripper, considering that 3D-printed components show uncertain characteristics that are affected by the manufacturing process and that the mechanical properties of the fingers affect the kinematic behavior and the grasping performance.

关键词： Soft robotics Soft gripper Underactuated gripper Robotic finger Finger's stiffness

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Results and Problems from Lab Testing with L-CADEL.V3 6th

Results and Problems from Lab Testing with L-CADEL.V3

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6th Symposium on Mechanism Design for Robotics (MEDER)

作者： Ceccarelli, Marco Kotov, Sergei Russo, Matteo Univ Roma Tor Vergata Dept Ind Engn I-00133 Rome Italy

ISBN: (纸本)9783031673856;9783031673832;9783031673825

Results of lab experiences with light revised prototype of L-CADEL.v3 are discussed to motivate improvement proposals in design and operation aspects. Onboard monitoring of the assisted elbow motion and corresponding power consumption are confirmed with satisfactory efficiency while issues are identified on user comfort and operation performance requiring future work on redesign device structure and functionality.

关键词： Motion assistance elbow assisting device prototype testing design

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